James and Silva aren't natural wingers and prefer playing on the right. And Costa was bang average at Bayern bar from a couple of wonder goals. Perisic offers us something we lack and that's a natural 2 footed player that will keep the width. And give Martial a chance to get his form back on the left.
How? They play in the same position. Martial needs a consistent run of games like 2015/16, not another limbo season.
Something I'm hoping Mourinho will trust to give him once he sorts out DM and possibly another FB. Less tracking back, and more shackles off him
